High-speed drill.



L. J. CAMPBELL. HIGH SPEED DRILL. APPLIOATION FILED JUNE 30, 1911.

Patented Nov. 19, 1912.

LEON J. EII LTJIPBTJLL, OF CHICAGO, ILLINQIE, ASSIGNUR T JAMES T. HEALY, TRUSTEE;

I 0? GHICfiGO, ILLINSIS.

Applicatiol fife-'1 31121030, 1911. Serial No. 53%220.

12mm Mandy COS'ZCiZT'Ib! i through Hm coull'al, fiongitudilml known Hun i hEON U". LX-sr-UFHELL, Hlklfi '2' the (MM. Hu1d }u\vs, as shown, are en mi JI-h8 i)fi1lilti fituigms and remn1g may: of shg ht'ly 105s Width than hall"; the

" m thaw cmm'ty of Geek and mm width'n'l' Hm (11%, thereby prm'idmg a space Bea 5 uws invented 2L filiW and useful (1* 3101' i tl'ierebetwesn, The jaws 2 and 3 -Speed Stills, are beveled from their ends toward their a complete specific/w buses, one being bevel-$81 on 0119013 the broad 3 sides of ihe (ll-Eli and the other on Lha other and side of the h'ifi, as shown more chzu'h' 1Q X pruvmi eansnfuctlon and 2%, therelgy providing 0139a;-

avid-P a bi fh L1 e13; bevelgei bearing 01' coniaci 19:15:95 5 and l 41.: m0 time "pom'; 01' bit, and mm a? winch is at one hvbem edge the a bad '01 shank; to provide i1nin and i316 nther mi the theylatml edge for attaching a tool 61 hard gm (it-ill. The bemhui faces 5 and 6 ate 15 13% to a soft steel. sin -1k; and ix" :u'mng evi in reversely eflsfiii relation to each 1}) very strung 3nd durable high (ther =1 U10 bass and outer ends of the jaws m; a minimum 9. i'. (V h 5 and. 3) s0 that lines indicntingih e hum: m said 110% when the jaws ur seen K 2 side view as "'m Fig. 2 (.XOSS or: intersect painted 011* m (1 dc-Jnsd hi the end; min- 1; bw''h of said planes in which said im'oled faces arclomtcd being yerpen- 7 dicuiar h) a single pianc passing through (he veni'ml axis vi the drill hetwem the jaws. ihe shank 7 ix profembiy but nof newssm'ii c (1F H111 same (-230: swi'ional Qinwnsions Mi I. Said sin-111k is likewise pru- 8 0 \viih s-mhvis'e'uxtondiw jaws 8 and O in sun-skis of he an-tiers hes-(v w ami. 1n the stimwailc man and 1L gb specfl drili. umbmhm'i Fig. 2 is a simiiur \C (Qi'f all from The $1 ml iiig, v m? fhu shank with like Fig: L is a ifl'agxn-untm y,

a Shank are jnimrd the jaws on file ms ova-mp each M1101". A transnlz'imgmi WM 10 made integral with milk. in mm} XS 8 a mi .3 on Hm shank 7 is adapted to "im jnain' end of thfi pum 01- ihe slut i; of H10 bit '1 when the latter an: {-11 chem." of the ina is m 1) mm 1m 1119 5: wk.

Hm mint ends of (he hit and shapk have h m 'fmmml m; above described they we piacml umei'har "with the beveled faces .11 cla m Rm M1112 jaws and P; meflapping and Lying farm of 101111. 13 is a 01 We h wdi 2d faces of the jaws g and 9 'uinii and of flu: apamix'clgy and with the web 10 lying in Li a the akri 1: baiween the java; 2- and 3. The i-oiuis between the bevelad. faces are then m. u. lgngth and cum: 7. 10d "in cutting edge, is in "the. mmsh'uctwn shown 1n 12 to 1' has szi'eel and at its joint inclusive. The shank "4' 1s pronded wlth 1 ailing ec lge u; is J a 1d 1% which are provided with 10 5215:, endiiy hevde i attaching iaces 15 and 16., making 3 s or M7115 3 at. the ands; 01": the gaws be parallel 1 1 I I 1 1 at oppasliia sums m a puma in; narrow suigs oi tile dull, and, at

ln-nvmi or welded togvthex ofthe shank and fit their inner ends extend diagonally across the drill betweenthe broad sides. The joint end 11 of the bit 1 is provided with concavely beveled sideslQ which fit between theLjaivs 13 and 14. The overlapping jaws of the bit and shank are so arranged that when the drill is in operation the jaws on the bit' are in advance of. the jaws on theshank, that is the aws on the shank are pushing agalnst the aws on the bit, thereby relieving the joint of all strain tending to.

pull it apart. Obviously when the drill is of SllillClQlllI- size the overlapping aws may be riveted together as well as brazedtcr jaws 2 and 3-'have been used up, since they will provide the hard steel for the cutting edge of the drill. Obviously also many details of the construction shown may be varied or omitted without departing, from the scope of the claims: Moreover, in its broader aspects the invention includes a construction embracing a shank and bit-each having a plurality of endwise projecting arms or jaws embracing the features of construction hereinbefore described, and is not limited to the specific construction shown in which two only of such jaws-are present, on each member. TlXG'CODSiItlClZlOIl embracingtwo jaws only on each member has,'however, the importantadvantage thatthe oppositely facing beveled or inclined bearing or contact faces of such jaws may be easily,

conveniently and cheaply formed, and this construction is therefore also claimed as part of my invention.

I claim:

1. A drill comprising two members a shank and a hit, each having a plurality of endwise extending jaws overlapping those'of the other, the jaws of each member being disposed laterally with respecttothecentral longitudinal axis of the drill and having their hearing or contact faces inclined or beveled to give endwise tapered form to said jaws.

2. A drill comprising two members a shank and a bit, each having a pair of endwise extending jaws overlapping those of the other, the jaws of each member being located at. opposite sides of a plane passing through the central longitudinal axis of the drill and having their hearing or contact t'accs oppositely inclined or bcvelcd to give endwise tapered form to said jaws.

3. A drill comprising two members a shank and a bit each having a pair of endwise extending jaws overlapping those of the other, the aws of each member being located at opposite sides of a plane pass 'ing through the central longitudinal axis of the drill and havingtheir bearing or contact faces oppositely beveled or inclined and located in planes perpendicular to the said first mentioned plane. p

at. A drill comprising two members a shank and a bit, each member being provided .witlrendwise extending jaws overlapping those of the other member, the jaws of each member being located at opposite sides of a plane passing through the central longitudinal axis of the drill and having their bearing or contact faces oppositelyinclined or beveled to give tapered form to said jaws. said oppositely inclined faces being' in effect relation to each other both at the bases and outer ends of the jaws.

A drill comprising two members a shank and a hit, each having a pair of endwise extending jaws overlapping those of the bther, the jaws of each member being locatd at opposite sides of a plane'passing' through the central longitudinal axis of the drill and having their bearing or contact faces inclined or beveled; to give tapered form to said jaws, one vof said members hav ing a transverse slot between its jaws,'and the othermeinber being provided with an integral transverse Web adapted to enter said slot. i j

In'witness whereof I have hereunto subscribed my name in the presence of two witnesses.

LEON J. CAMPER LL. 

